北京中关村地区气溶胶的酸性测量  

Measurement of Aerosol Strong Acidity in Zhongguancun,Beijing

作　　者：周福民[1] 孙庆瑞[1] 王美蓉 邵可声[1] 

机构地区：[1]北京大学环境科学中心环境模拟与污染控制国家重点联合实验室

出　　处：《环境科学》1998年第2期6-11,共6页Environmental Science

基　　金：国家"八五"科技攻关项目

摘　　要：为了研究大气气溶胶的酸性及其粒径分布，笔者利用自制环状扩散管和三级撞击式组合采样器采样，ｐＨ测量和傅利叶红外光谱技术测量相结合，于１９９４年冬季至１９９５年冬季在北京中关村地区进行了采样分析．结果表明，北京中关村地区气溶胶存在酸性组成，且酸性主要分布于粒径１．５μｍ以下的细粒子中，测得的细粒子最大酸度（以Ｈ＋计）为５６．６ｎｍｏｌｍ－３，各季节中１９９４年冬季和１９９５年夏季气溶胶酸性较强，日平均一般在５ｎｍｏｌｍ－３以上．ＦＴＩＲ法直接测量了气溶胶中的ＨＳＯ－４，并表明ＨＳＯ－４是气溶胶中的主要致酸因素之一，细粒子中ＨＳＯ－４约占ＳＯ２－４的６％左右．In order to study the aerosol acidity and its diameter dispersion,between the two winters of 1994 and 1995,samples in Zhongguancun district of Beijing were collected with annular denuder and three stage impact sampling system,and analyzed by means of measurement of pH and Fourier Transform Infrared(FTIR) technique.It was showed that in this district,there exists in aerosol the acid composition with its distribution mainly in the fine particles and that the strongest acidity is 56 6nmol(H +)·m -3 with the relatively strong aerosol acidity in the winter of 1994 and the summer of 1995.The daily average of aerosol strong acidity is usually over 5nmol(H +)·m -3 .HSO - 4 was directly detected and measured with FTIR technique.It was found that HSO - 4 is one of the main reasons for the acidity of aerosol,and that HSO - 4 is about 6% of SO 2- 4.The result of regression indicated there is the obvious interrelation among the aerosol acidity,SO 2- 4 and NH + 4 in the fine particles.

关 键 词：气溶胶 北京 酸性 测量 大气污染 

分 类 号：X513.01[环境科学与工程—环境工程]